Method for the manufacture of sandals and similar footwear



Dec. 28, 1943. s; c vE 2,337,590

METHOD FOR THE MANUFACTURE OF SANDALS AND SIMILAR FOOTWEAR Filed July 1, 1941 KMZMWW Patented Dec. 28, 1943 OFFICE METHOD FOR THE MANUFACTURE OF SANDALS AND SIlVIILAR FOOTWEAR Segismundo Claveria, Vich, Spain Application July 1, 1941, Serial No. 400,664

In Spain June 25, 1940 1 Claim.

My invention refers to a method for the manufacture of sandals and similar light footwear, with vulcanized soles, and especially to certain improvements introduced in this manufacture, by which there are obtained sandals of excellent quality.

One object of my invention is to obtain sandals of the type named alpargatas in Spanish speaking countries and also light shoes of the type known as beach shoes, that allow of the ventilation of the foot through the sole, in the same way as occurs with ordinary alpargatas or hempen sandals, but which have at the same time the sole smooth and. uniform and covered with rubber in the visible part, presenting the aspect f a footwear with a rubber sole.

Another object of the invention is to obtain a footwear of this type in which the upper shall be perfectly joined to the sole without necessity of any stitching.

Another object of the invention is to provide a method for manufacturing this class of footwear in a simple, rapid and economical way, obtaining sandals or light footwear which always remain exact in shape and measurement and of a perfect finish.

The invention consists essentially in forming the sole of the sandal or footwear, composed of a relatively thick layer of a filling fabric woven as single or compound cloth, i. e. of a single or mixed fabric, and obtained from a material of relatively low qualit for instance waste from wool, hemp, jute, broom, cotton, etc. This filling fabric has adhered to one side a fabric of any convenient kind forming the insole of the shoe and on the other has adhering a piece of lesser size than the sole, that is to say, it does not reach the edges of the same, of a texture of single or compound cloth formed of canvas or hemp or the like, of good quality or another similar material, making up the surface of the tread of the footwear. As has been stated, this piece of canvas or hemp that constitutes the tread of the footwear is of lesser size than the sole, although shaped similarly so that there is margin from the outside edge of this piece to the outside edge of the sole. The outside piece of hemp r canvas is joined to the sole of filling material, either by sewing or fastening by means of a rubber cement, the joining of these two surfaces being carried out only in parts or intermittently, that is to say that the adhesive layer does not completely cover the area of the sole and consequently, it is understood that it will allow h ventilation of the foot, seeing that all the sole is of vegetable fibre.

On the edges of the sole not covered by the outer tread of canvas or hemp, there is mounted the upper of the footwear, the lower edge of which is turned beneath the edge of the sole to which it adheres by means of an adhesive, for instance, a rubber cement or rubber latex.

Once the upper is mounted on the sole, the whole of the edge is covered by means of a strip of raw rubber, which covers a side portion of the shoe corresponding to the height of the sole and is turned beneath the face of the tread until it covers the edge of the exterior piece of canvas. Finally, on the heel part. there may be arranged a portion of rubber sheet of a convenient thickness in order to form a light heel and the whole product is then submitted to vulcanization in a suitable mould. in whi h at the same time it is pr ssed. in which operat on the top ed e of the side strip of rubber. which bo ders the sole is shaped forming a slight welt which brings out the aspect and finish of the footwear.

In the attached drawing there is shown, as an example, a sandal manufactured according to the method of this patent.

Figure 1 is a longitudinal section of the sandal.

Figure 2 is a cross section through the line II-II of Figure 1.

In these figures there may be seen the special composition of the sandal, which i made up by a sole of a filling it of a suitable thickness, and preferably of an economical material, felted or not, and of single or compound cloths, made of a cheap material, such as Waste of hemp, jute, cotton, broom, etc. On the top part it may have attached, if desired, an insole ll formed of a suitable material.

The upper of the sandal i2 is lasted or attached to the filling sole, in such a way that the lower edge of the said upper is turned beneath the edge of the sole, to which it is joined, by previously spreading on the said edge an appropriate adhesive, for instance, a composition of rubber.

On the outer face of the sole there is arranged a piece or layer 53 of lesser dimensions than the sole, of canvas or other suitable material, of good quality and great resistance, and this canvas is applied on the sole either by sewing same or by means of an adhesive which in such case is only distributed at points or that is to say, in an alternate manner, in other words in such a way that the adhesive does not form one continuou layer but allows spaces to remain to allow ventilation of the foot.

The outer layer of material I3 is of lesser dimensions than the sole, but shaped in a similar way to the same, so that there remains a suitable margin around such layer I3 to reach the edge of the sole, on which margin there is arranged a strip of raw rubber l4 that covers the side edge of the sandal and is bent at an angle on the inside face of the sole in order to cover the border of the outside piece of canvas l3.

If desired, there may be arranged a layer of rubber sheet l5 on the back part of the footwear, to make a small heel of the desired thickness. The whole is then vulcanized in a suitable mould in which it remains suitably shaped, applying the necessary pressure in order to ensure the joining between the different pieces.

The footwear made in accordance with the method object of this patent, presents a good appearance and is highly hygienic. In the first place, the sole remains bordered by the outer rubber strip, which can be moulded with the upper border bevelled thus forming a slight welt. In addition the canvas of the outer part of the sole gives a highly resistant walking surface and at the same time smooth and flexible, which does not tire the feet and at the same time allows the The described embodiment of the invention shows only an example of the manufacture of footwear according to the method of my invention, and it is understood that there may be introduced all those variations in construction and detail that may be advisable in practice, without altering the essence of the invention. For example, this invention may be applied to the manufacture of the type of footwear known as beach footwear, obtaining a footwear with uppers of duckcloth and a mixed sole of fibres and rubber.

I claim:

A method of manufacturing sandals and the like comprising forming a sole of filling material made from a relatively thick layer of fabric of low resistance to wear, then securing the upper to the edges of said sole by mean of a suitable adhesive, then applying upon the exterior face of said sole by means of an adhesive distributed at separated points a second sole of textile ma terial of high resistance to wear which is similarly shaped as said sole, but being of less dimensions so that a margin extends between the edge of said second sole and the edge of said first sole, whereby ventilation through the soles is made possible, and then applying upon the edges of said first sole and said second sole a strip of unvulcanized rubber which covers the edges of said soles and said margin and then vulcanizing said rubber.

SEGISMUNDO CLAVERIA. 

